Preheat your oven to 350°F (175°C) and prepare a 9×13 baking sheet with non-stick cooking spray. This will make sure our sliders do not stick during baking.
In a small mixing bowl, combine the mayo, French dressing, yellow mustard, sweet pickle relish, white vinegar, granulated sugar, onion powder, paprika, garlic powder, and a pinch of salt to create our special Mac sauce. Stir well and place it in the refrigerator until you are ready to use it.
In a large mixing bowl, take the ground beef and season it with salt, pepper, garlic powder, and the chopped onion. Mix everything together until well combined.
Now, press this beef mixture into the baking sheet, making a nice flat rectangle. We want it to bake evenly. Place it in the oven and bake for 12-15 minutes until cooked through.
While the beef is in the oven, take your Hawaiian rolls and slice them in half horizontally. Be careful to keep the top and bottom parts intact. Spread a generous amount of your Mac sauce on the bottom halves.
On top of the sauce, add a layer of shredded lettuce, the cooked hamburger patty, American cheese slices, and sprinkle on those lovely pickle chips.
Place the top halves of the rolls back on top and gently press down to hold everything together.
Now, brush the tops of the rolls with melted butter and sprinkle with sesame seeds for that authentic touch.
Transfer the sliders back to the baking sheet and return them to the oven for an additional 5-10 minutes, until the cheese is melting and bubbly.
Serve those lovely sliders immediately, and don’t forget some crispy french fries or extra Mac sauce on the side!